package com.demo.tcp;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.SimpleChannelInboundHandler;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.UUID;

/**
 * @author gy
 * @date 2022/7/31
 */
public class MyServerHandler extends SimpleChannelInboundHandler<ByteBuf> {

    private int count;

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
        byte[] buffer = new byte[msg.readableBytes()];
        msg.readBytes(buffer);

        // 将buffer转成字符串
        String message = new String(buffer, StandardCharsets.UTF_8);

        System.out.println("服务器在收到客户端的数据为: " + message);
        System.out.println("服务器接收到的消息量 = " + (++this.count));

        // 服务器回送数据给客户端，回送一个随机id
        ByteBuf responseBuffer = Unpooled.copiedBuffer(UUID.randomUUID().toString() + "|", StandardCharsets.UTF_8);
        ctx.writeAndFlush(responseBuffer);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
